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[目的]明确孔雀草与淡紫拟青霉2种生防因子协同作用防治烟草根结线虫的效果,为烟草根结线虫病的生物防治提供参考。[方法]通过田间试验研究烤烟间作孔雀草同时联合使用淡紫拟青霉对烤烟生长特性以及对根结线虫病发病情况的影响。[结果]孔雀草与淡紫拟青霉联合使用不仅能显著提高淡紫拟青霉对烟草根结线虫防治效果的稳定性,还能明显提高烤烟的农艺性状。烤烟间作孔雀草能显著增加烟株的叶片宽度,施用淡紫拟青霉能显著增加烤烟的叶片长度;在株高、茎围、最大叶长和最大叶宽上,孔雀草与淡紫拟青霉联合使用时均明显优于单一处理。单一施用淡紫拟青霉对根结线虫的平均防效为67.2%,施用淡紫拟青霉的同时间作孔雀草,平均防效在73%以上。[结论]孔雀草与淡紫拟青霉协同作用防治根结线虫有显著的增效作用。 相似文献
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AM真菌对3种花卉生长发育的影响 总被引:2,自引:0,他引:2
研究3种AM真菌对大丽花、孔雀草和金盏菊生长发育的影响.结果表明:接种AM真菌,提高了花卉幼苗的移栽成活率,叶片叶绿素含量和氮、磷、钾含量增加,生长量增加,开花期提前,盛花期的着花数增多,花期延长.大丽花和金盏菊对摩西球囊霉的依赖性最强,孔雀草对地表球囊霉的依赖性最强. 相似文献
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Background: The minimum set of sub-models for simulating stand dynamics on an individual-tree basis consists of tree-level models for diameter increment and survival. Ingrowth model is a necessary third component in uneven-aged management. The development of this type of model set needs data from permanent plots, in which all trees have been numbered and measured at regular intervals for diameter and survival. New trees passing the ingrowth limit should also be numbered and measured. Unfortunately, few datasets meet all these requirements. The trees may not have numbers or the length of the measurement interval varies. Ingrowth trees may not have been measured, or the number tags may have disappeared causing errors in tree identification. Methods: This article discussed and demonstrated the use of an optimization-based approach to individual-tree growth modelling, which makes it possible to utilize data sets having one or several of the above deficiencies. The idea is to estimate all parameters of the sub-models of a growth simulator simultaneously in such a way that, when simulation begins from the diameter distribution at the first measurement occasion, it yields a similar ending diameter distribution as measured in the second measurement occasion. The method was applied to Pinus patula permanent sample plot data from Kenya. In this dataset, trees were correctly numbered and identified but measurement interval varied from 1 to 13 years. Two simple regression approaches were used and compared to the optimization-based model recovery approach. Results: The optimization-based approach resulted in far more accurate simulations of stand basal area and number of surviving trees than the equations fitted through regression analysis. Conclusions: The optimization-based modelling approach can be recommended for growth modelling when the modelling data have been collected at irregular measurement intervals. 相似文献
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多效唑对波斯菊和孔雀草种苗矮化效应的研究 总被引:1,自引:0,他引:1
波斯菊和孔雀草是两种常用的园林花卉。为解决其种苗生产中常因下胚轴伸长等因素造成的种苗过高,株型散乱问题,本文研究了不同品牌的多效唑在不同浓度和不同施用方式的条件下对种苗矮化效果的影响,以期找到调控的最佳品牌、最佳施用方式和最佳浓度,为种苗的高质量、规模化生产提供理论的指导参考。研究发现:七洲牌多效唑溶液对波斯菊和孔雀草的矮化效果最好,矮化效果最好的处理都是以2mg/L的七洲牌多效唑溶液采用低浓度多次施用的处理。 相似文献
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对不同品种的孔雀草F2代植株进行人工授粉,对人工授粉与自然授粉花朵的结实率进行比较研究。结果表明:品种间结实率存在差异。20号品种的结实率最高,13号品种的结实率最低;除6号、7号与13号品种外,舌状花植株的结实率比筒状花植株的结实率要高;人工授粉的结实率普遍比自然授粉的结实率高,除3号与6号品种外,其中8号品种授粉处理下结实率的差异最为显著,2号品种的差异最小。 相似文献
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菊科花卉常见缺素症及植株养分含量变化探讨 总被引:5,自引:1,他引:4
通过溶液培养的方法,研究了3种主要菊科花卉(金盏菊、孔雀草、万寿菊)在缺N、P、K、Ca 、Mg、S条件下的缺素症状及其生物量与营养元素变化情况。结果表明,金盏菊、万寿菊缺N,孔雀草缺K时症状最为明显;缺N对金盏菊、孔雀草、万寿菊的植株生物量影响最大;与全素(CK)相比,金盏菊和万寿菊缺K处理植株N浓度增加,3种花卉缺N、缺K处理均增加植株的P含量,但缺P处理降低植株K浓度,缺K处理增加含Ca量,缺Ca处理增加含K量和含Mg量,金盏菊缺Mg处理的含K量增加,3种花卉缺S处理植株S含量降幅不大,孔雀草和万寿菊缺N、P、K、Ca处理均可导致植株S含量增加。 相似文献
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